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Five Americans troops were killed in an apparent coalition airstrike in southern Afghanistan, officials said Tuesday, in one of the worst friendly fire incidents involving United States and coalition troops since the start of the nearly 14 year war.

The U.S.-led international coalition said the service members were killed in an apparent friendly fire incident, which an Afghan official said was an airstrike in southern Zabul province. A statement said all five soldiers died on Monday but did not give further details on the attack.

"Five American troops were killed yesterday during a security operation in southern Afghanistan. Investigators are looking into the likelihood that friendly fire was the cause. Our thoughts and prayers are with the families of these fallen," Pentagon spokesman Rear Adm. John Kirby said.

If confirmed, it would be one of the most serious cases involving coalition-on-coalition friendly fire during the war.

"The casualties occurred during a security operation when their unit came into contact with enemy forces. Tragically, there is the possibility that fratricide may have been involved. The incident is under investigation," the coalition said in an earlier announcement.

One of the worst such incidents came in April 2002 when four Canadian soldiers were killed by an American F-16 jet fighter which dropped a bomb on a group of troops during night firing exercise in southern Kandahar.

A senior police official in southern Zabul said the coalition soldiers were killed when they called for close air support.

Provincial police chief Gen. Ghulam Sakhi Rooghlawanay said there was a joint operation by Afghan and NATO troops in the area's Arghandab district early Monday. After that operation was over, the troops came under attack from the Taliban and called in air support, he said.

"After the operation was over on the way back, the joint forces came under the attack of insurgents, and then foreign forces called for air support. Unfortunately five NATO soldiers and one Afghan army officer were killed mistakenly by NATO air strike," Rooghlawanay said.

There was no way to independently confirm Rooghlawanay's comments. The coalition would not comment and NATO headquarters in Brussels also declined to comment.

The only U.S. troops now involved in combat operations are usually Special Operations Forces that mentor their Afghan counterparts. They often come under fire and are responsible for calling in air support when needed. Because of constraints placed by outgoing Afghan President Hamid Karzai, such air strikes are usually called "in extremis," or when troops fear they are about to be killed.